Add myself as the PS4/PS5 code owner (llvm#108002)

As discussed here:
https://discourse.llvm.org/t/new-ps4-ps5-code-owner/80901

Author: jmorse

llvm/Maintainers.md

@@ -354,10 +354,10 @@ [email protected] (email), [mstrorsjo](https://github.com/mstrorsjo) (GitHub)
 Michael Spencer \
 [email protected] (email), [Bigcheese](https://github.com/Bigcheese) (GitHub)
 
-#### Sony PlayStation®4 support
+#### Sony PlayStation support
 
-Paul Robinson \
-paul.robinson@sony.com (email), [pogo59](https://github.com/pogo59) (GitHub)
+Jeremy Morse \
+jeremy.morse@sony.com (email), [jmorse](https://github.com/jmorse) (GitHub)
 
 #### Inline assembly